Device for truing grinding wheels



Sept 17, 1957 J. ANTON DEVICE FOR TRUING GRINDING WHEELS INVENTOR. l 5 5 JOE ANTON ATTORNEY United States Patent DEVICE FOR TRUING GRINDING WHEELS Joe Anton, Fresh Meadows, N. Y.

Application April 27, 1954, Serial No. 425,958

2 Claims. Cl. 125-11 This invention relates to improvements in tools for truing grinding wheels and is more particularly arranged for use on grinding machines having magnetic chucks.

Another object of this invention is the provision of a truing device for grinding wheels of a base having an inclined upper surface and a shaft rotatable on said base and carrying a diamond up for truing grinding wheels.

A further object of the invention is the provision of the device of the character described on a laminated base having a shaft joiurnaled therein with its axis inclined to the vertical. A holder secured to said shaft and membering up with the surface of said base and constituting a member by means of which said shaft may slowly be manually rotated.

Other objects and advantages of the invention will be apparent to those skilled in the art upon a study of this specification and the accompanying drawings.

Referring to the drawing which is given by way of example to illustrate the invention:

Figure 1 is a plan view of a preferred embodiment of the device as seen along the line 11 of Figure 2;

Figure 2 is a left side elevation;

Figure 3 is an elevation taken along the lines 3-3 of Figure 1;

Figure 4 is a sectional elevation taken along the line 44 of Figure l; and

Figure 5 is an exploded view showing the shaft carrying the diamond point removed from the disk-like member by means of which said shaft is manually rotated.

Referring first to Figures 1, 2 and 3, my new and improved grinding wheel truing device is comprised of a base block having the upper surface 11 inclined to the horizontal. The block 10, in order that it may be used with either alternating current or direct current is laminated by means of alternate steel and brass strips 12 and 13, respectively, said strips being secured together in any suitable manner so as to form a unitary structure.

The upper surface 11 of the base block 10 has a bearing hole 14 formed therein and the axis of this hole is 90 with respect to the surface 11. A shaft 15 has an upper conical point 16 which has an industrial diamond 17 set into the apex thereof.

The shaft 15 forms a working fit in the bearing hole 14 and the lower end of the shaft is preferably square with the axis. A disk member 18 is of substantial thickness and has a central hole 20 formed therein which snugly fits the shaft 15 and which is secured on the shaft by means of a set screw 19. When the disk is secured on the shaft, the lower end of the shaft should protrude from the disk a distance at least slightly less than the depth of the hole 14 so that the lower surface 21 of the disk bears on the surface 11.

One example of the use of my new and improved truing device is as follows:

To true the grinding wheel on a surface grinder, which is equipped with a magnetic chuck, the device is positioned on the magnetic chuck with the face 12 (Figure 2) towards the operator. Now, with the grinding wheel rotating, the carriage is adjusted horizontally and vertically until the axis of the diamond tipped shaft 15 cuts the axis of the wheel. The device for feeding the carriage laterally (toward and away from the operator) is adjusted until the center of the diamond is almost in contact with the periphery of the wheel and adjacent to one edge thereof then operating said device to effect a back and forth movement so that the diamond is not still, the longitudinal feed is advanced very slowly until the diamond very slightly engages the periphery of the wheel and when this happens, the said device is operated to feed the carriage back and forth so that the diamond traverses the face of the wheel and removes the high spots therefrom and as the work progresses, the operator rotates the shaft by means of the disk 18. This is continued until the diamond traverses the entire surface of the periphery and thereby the wheel is trued.

By the rotation of the shaft in the manner described above, the wear on the diamond is substantially uniform with the result that its life is increased and also the truing is effected with the minimum removal of the material of the grinding wheel.

Another important feature of my new and improved truing device is that after the wheel has been trued by means of the device, the act of switching off the current to the magnetic chuck enables the operator to pick the device up and set it aside so that he can go ahead with the work with a minimum of delay.

Although I have herein shown and described a preferred embodiment of the device, it will be obvious that many changes may be made in the arrangement shown within the scope of the following claims.

I claim:

1. In a device for truing grinding wheels, a rectangular base having an upper surface slightly inclined with respect to the vertical, said base being adapted to be mounted on a magnetic chuck on the carriage of a grinder, a bearing hole formed in said base square with and terminating in said inclined surface, a shaft journaled in said bearing hole and having a free end somewhat conical in form and carrying a diamond, a substantially massive disk secured on said shaft and having its lower surface bearing upon and freely rotatable on said inclined surface, the periphery of said disk being adapted to be engaged by an operator for manually rotating said shaft during the time a truing operation is being carried out to insure even wear on and a minimum waste of said diamond, the contacting surfaces of said base with said shaft and with the lower surface of said disk extending on the plane of said upper surface and the periphery of said shaft extending along the inner surface of--said bearing and tending conjointly to prevent said diamond from chattering as said truing operation is being carried out.

2. In a device for truing grinding wheels, a rectangular base having an upper surface slightly inclined with respect to the vertical and comprising a bearing surface, said base being adapted to be mounted on a magnetic chuck on the carriage of a grinder, a bearing hole formed in said base square with and terminating in said upper surface, a shaft journaled in said bearing hole and having a free end somewhat conical in form and carrying a diamond; a substantially massive disk having a diameter substantially equal to the Width of said base and secured on said shaft and having its lower surface with respect to the axis of said shaft and bearing upon, supported by and freely rotatable on said upper surface; the bearing of one of said surfaces upon the other being maintained by gravity, the periphery of said disk being adapted to be engaged by an operator for manually rotating said shaft during the time a truing operation is being carried out, to insure even wear on and a minimum waste of said diamond, the substantial contact between the lower References Cited in the file of this patent 5 UNITED STATES PATENTS 1,505,322 Desmon Aug. 19, 1924 2,199,053 Meeson Apr. 30, 1940 2,337,249 Koller .Dec. 21, 1943 10 2,386,283 Wiken Oct. 9, 1945 Shugars Jan. 8, 1946 Palmer May 14, 1946 Bo-use June 11, 1946 Bruce Feb. 12, 1952 Finke Feb. 26, l952 Chandler May 19, 1953 FOREIGN PATENTS Great Britain Sept. 27, 1934 

